An electrode material for a secondary battery has a carbon fiber. This carbon fiber has a coaxial stacking morphology of truncated conical tubular graphene layers, wherein each of the truncated conical tubular graphene layers includes a hexagonal carbon la...

A proton conducting electrode useful for a fuel battery. The proton conducting electrode is comprised of a mixture including a fullerene derivative and an electron conducting catalyst, wherein the fullerene derivative is composed of carbon atoms forming fu...

A proton conductor comprises a carbonaceous material essentially comprising a carbon, into which proton dissociating groups are introduced. In the proton conductor, protons migrate between the proton dissociating groups. Also, the ion conductivity of the p...

Fine carbon fibers having a fiber diameter of 1 mu m or less, an interlayer distance d002 between carbon layers as determined by an X-ray diffraction method of 0.335 to 0.342 nm or less and satisfying d002 < 0.3448 - 0.0028 (log phi ) where phi stands for ...